Snowpit in Mini Morrison Drainage and Avalanche Activity

SNOWPACK OBSERVATION
NW test slope in the Mini Morrison Drainage
Submission Info
Member
Saturday, March 24, 2018 - 2:15pm
Red Flags: 
Recent loading by new snow, wind, or rain
Mini Morrison Drainage 37° 33' 53.7552" N, 118° 50' 36.87" W
Snowpit Observations
More detailed information about the snowpack: 

Toured up the Mini Morrison Drainage from Convitct Lake to assess wind loading, look for deep facets, and observe recent avalanche activity.  

Still lots of bushes starting out from the TH.  Snow surface up to 10'00 a mix of supportable crust, breakable crust, firm wind scoured, sastrugi, and wind board.  Strong winds all day with significant snow transport and significant scouring down to earth in some places (see photo).  

Saw the partially snow covered debris of multiple small and some large slides on the E face of Mini Morrison, the debris of which filled and partially ran down the drainage (see photo).  Saw mutiple crowns and lots of partially debris in Old Man's Bowl (see photo). Saw several partially covered crowns on NW slopes.  These all seem to be mid storm avalanches.  No recent, post storm avlanche activity observed.  

Dug a pit on a small NNW 30 degree slope at 9970.  Dense 10cm windslab, CTE1Q1, on top of 120 cm of storm snow.  Two compression test results within storm snow, CTM14Q2 and CTH22Q3.  Dug down deeper and found sugary faceted snow below depth of165cm.  

 

 

 

 

Snowpit or crown profile photo or graph: 
Snowpack photos: 
Strong S winds loading northern slopes.
Avi debris filling the drainage from multiple slides on E face.
Multiple crowns and avi debris in Old Man's Bowl.
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
Clear
Air temperature: 
Below Freezing
Wind Speed: 
Strong
Precipitation: 
None
Air temperature trend: 
Static
Wind Direction: 
South
Accumulation rate: 
None

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